OPISTHOBRANCHIATE MOLLUSCA FROM MONTEREY BAY. 151 



the loop of the stomach. Its whole anterior and nearly all of the lateral faces are closel}' invested by 

 tile pink hermaphroditic gland with its thick jiinkish lobules. 



The narrow hermaphroditic duct passes (ilili.|ncly downward from the upper anterior border of the 

 ovotestis for a distance of aliout 2.."i nun , w iiii ;i diameter of 0.4 mm., dilating into the large sausage- 

 shaped ampulla. Thesilvery gray heriiiaplir< .clitic ampulla (pi. xxi, fig. 103, amp.) lies upon the upper 

 and central portion of the anterior genital mass, extending forward to its anterior end, is 3 mm. in 

 length, and has a maximum diameter of 1 mm. At the anterior margin it divides into the spermatic- 

 duct and the oviduct, the first of which passes immediately into the enormous white prostate gland (pi. 

 XXI, fig. 103, pr. (/I.) overlying the whole inner face of the anterior genital mass and forming fully one- 

 half of its bulk. The prostate gland describes a loop backward and then cioubles forward in a broad 

 fiattened dilation of 4 mm. in length by 2.5 mm. in width, its distal anterior end giving origin to the 

 narrow \'as deferens (fig. 103, r. d.), which, after a short irregularly coiled portion, passes directly out- 

 ward and forward into the penis. The retracted penis (fig. 103, p.) is about 2 mm. long, its distal 

 end (the glands) bluntly conical, 0.3 mm. in length, and bearing an armature of minute hooks in the 

 last 0.24 mm. of its canal. The oviduct passes directly into the anterior margin of the nidamental gland, 

 and close to its point of entrance appears the uterine duct (fig. 103, «. d.), about 0.2 mm. in diameter, 

 coursing backward for 2.5 mm. into the spermatotheca, receiving the slender duct of the spermatocyst 

 just before entering it. The spermatocyst (fig. 103, sp. c.) is small, elongate-oval, 1 mm. long by 0.5 

 mm. broad, and lies upon the mid-dorsal surface of the genital mass at the anterior border of the sperma- 

 totheca. Its duct is very slender, being but slightly longer than the cyst itself. The spermatotheca 

 (fig. 103, sp.th.) is voluminous, flattened, spherical in form and aljout 2.3 mm. in diameter, and occu- 

 pies the upper posterior face of the anterior genital mass. At its anterior face it receives the uterine 

 duct and gives off the vaginal duct very close to its entrance. The latter is a narrow, nearly straight 

 tube about 3 mm. long by 0.2 mm. in diameter, which courses obliquely outward and forward to the 

 short vagina (fig. 103, rag.), which is nothing more than its dilated outer extremity. 



This beautiful species has been observed at all times of the year, in about equal numbers, under 

 shelving stones between tide marks all along the coast from Monterey to Point Lobos. It has also 

 been taken by Prof. T. D. A. Cockerell at San Pedro. The eggs are laid in the usual spiral form, the 

 band being narrow and of the same color as the animal. The brief summary of its morphological 

 characteristics here given is amply sufficient to show its nonconformity to any of the genera of (ic^mici- 

 doridinw as yet described. A more complete study of the genus is in preparation. 



Type no. 181275, U. S. National ^[useum. 



Family E. CORAMBID.E. 



Corambidit Bergh, Syst. d. Nudibr. Moll., i>. la'i, l.scji;. 



Body doridiform, oval, depressed. Notajum somewhat convex; i)erinot;eum wide, flattened, 

 rounded in front, deeply incised in the median line behind, everywhere projecting beyond the foot. 

 Rhinophores retractile into sheaths, the posterior side of which is longitudinally cleft; the clavus 

 cylindrical, simple, bearing a wing on each side — somewhat rolled backward. Branchiee of few, sep- 

 arate, sinijily pinnate leaves on the under side of the posterior mantle margin on each side. Anus 

 postcro-iuedian l.c-twccii pcrin.ct.i'nin and foot, the renal pore above and at its right. Head concealed 

 by mantle, small, pn i.lii, ,d lai.ially into triangular tentacles. Sides of the body very low; on the 

 right anterior side the ^rcnital papilla with three openings. Foot narrower than the back, rather 

 wide, emarginate in front, rounded behind. 



Pharyngeal bulb with two prominent ridges below in the buccal cavity. Iladula rather narrow; 

 the rhachis naked; pleural with a larger denticulate tooth and a few (4) external hooked teeth. 

 Buccal crop connate to the pharyngeal bulb. 

 Glans penis unarmed. (?) 



Family F. DORIDOXID.E. 



Doridoxifke Bergh, The- Danish Ingolf Expedition, ii, no. 3, 1900, p. l.i. 



Form of body as in Doridida?, Init without dorsal Ijranchia; and with laterally placed anus. 

 Rhinophores as in Uorididie. 



Pharyngeal bulb strong, mandiljles very strong. Radula with a large median tooth, pletn-a; 

 multi-dentate. 



